In the present study, maximum Rayleigh wavelength of the generated vibrations was 21.6 m for a low frequency of 10 Hz which is the most critical case in vibration isolation. As seen from the charts proposed by Tsai and Chang [42] and Saikia and Das [43] (Fig. 9) D should be approximately 0.5 or higher in order to obtain an AR of 50% or higher when normalized trench length, L, is equal to 4 and 1, respectively. For D = 0.5, trench depth was 10.8 m which was not practically and economically feasible to install the open trench as a wave barrier. Therefore, in this study, wave barriers were not preferred for isolating the ground borne vibrations.